Here are some points to consider in order to resolve duplicate folders:

1. Check if the files have the same file names and sizes. It is possible that your system may be mistaking two different files for the same one.
2. Ensure that the folder permissions are consistent across all folders, and that new folders created will inherit the same permissions.
3. Backup your important data before deadding any duplicate folders.
4. Remove the duplicate folders one by one, checking to make sure that the correct information is present.